I still dislike Kimberly but I understand her frustration.
She tells TJ she’s depressed, feels isolated but wants to try to make things work with him.
Instead of comforting her, he tells her she can “Go back to America”. He wasn’t even trying to comfort her. He had no empathy for her at all. He came across as a jerk.
Anyone would be frustrated if they were in her shoes.
I agree